Jordan_

The .112v was the injection pump shutoff wire. Thanks for the suggestion. I’ve changed to 0.5v. I heard the Timbo apps aren’t ideal though due to them being default .65v or something? The issue ended up being the VP44 after all as far as I can tell due to one test: adding 2-stroke oil to the fuel. The symptoms have greatly been reduced since doing that, and on many occasion doesn’t even stall. It’s a bummer, but it’s nice to at least be fairly certain.

I believe that is an accurate assessment. So that was an excellent idea about the ASD relay. Unfortunately, it works exactly as it should. When testing with the Meter, no 12v firings were measured when it was cutting out. It remained steady at 0.112v until shutting off the truck with the key and it went to 12v for, interestingly, 14.5 seconds (not the 3 seconds according to that write-up) However, the cables are in somewhat rough shape. 4 of the 6 are a bit frayed. The physical wire’s themselves seem ok except the ASD, it has about half the strands cut (a little further up than where most of the bare copper is in the photo)

Thanks for the reply. I'll do you one better, here is a video: https://youtu.be/xlBDX3KDxIs I suppose you could say "lope" instead? How would you describe it? After putting in gear it will stall immediately (if it's at that point). Yes, the P0216 code came on 3 years ago as well. Replacing the APPS sensor in that moment at minimum got rid of all the symptoms, and now they are back. Attached photos of the screw. Unfortunately, it's too secure. I'd tried seeing if I could adjust it before and it just breaks bits. I did further testing with the alternator yesterday. I thought I had hit the jackpot, as when I removed the cable and went into gear, I got no stall. So, I replaced the alternator. I tried again and got an immediate stall.. bummer. But I couldn't get it to stall again yesterday evening, progress, coincidence? Before the ac noise between negative battery and alternator post was about .035-.045. Now it's .032-.042. (between battery terminals it is .026-.035) Jumper cable between negative batteries doesn't change it. Could it actually still be the alternator and the ac noise from the new alternator still just be too high? I tested the truck this morning. Starting, putting in gear, waiting 4 minutes and it occurred again. I disconnected the alternator, but it stalled. Reconnected again, and couldn't get it to stall again. It could be that once the sequence starts, it needs to finish it? I couldn't get it to stall again. Tried 4 hours later, can't get it to stall. Will try again tonight. I can't confirm the idle validation yet. The scan tool I have currently isn't good enough. I should have a scan tool in a day or two capable of testing that and more if needed.

Need some help. I have an issue with my truck where it will progressively hiccup then stall. Truck is a 99' 2500 auto 4wd shortbed If I start the truck and change to gear, after 4 minutes truck will start hiccupping and it will hiccup in intervals of exactly 5.4 seconds where they progressively get worse. After about a dozen or so it's bad enough that it's able to stall. If I start and stay in idle, wait 5 minutes, change to gear, it will immediately stall. The predictability is truck start -> 5 minutes pass -> will stall. However: I can circumvent it by applying and holding throttle for about 5-10 seconds. If I do this before, during, or after that hiccupping cycle starts, I can drive like normal for however long I want with no issues. But once the truck is shut off, depending how long I wait to start the truck again, it will either immediately stall or go back to square one. The sooner I start the truck, the sooner the cycle starts. Overnight, the hiccupping will start after 4 minutes. So, this issue happened 3 years ago as well. Now is the time to mention I had, and have again, a P0216 code. Last time, after I changed the factory APPS sensor to the WELLS, everything ran smoothly and the code went away and all issues went away for over 2 years. Currently, the WELLS APPS is set to .533v. The original was labeled .536v before being replaced. Fass lift pump steady at 14-15psi. Restarts immediately after stall. Alternator outputs 13.5-14v. Potential issues: Live throttle reading is between 10.2% and 73% Truck will not reset APPS. Remains 10.2%-73% after multiple attempts. While live throttle reading is stable with key on, engine off, with the truck on it oscillates ~9.8%-10.2% Troubleshooting so far: -I've tested the APPS sensor voltage while the truck is on and off with a multimeter and it remains stable, even during the hiccups/stalls. While all measures don't point to it being the cause again, a replacement is on the way just to rule it out completely. -I've tested the idle at 6v and 5v. Symptoms change a little but remain. -I've done the W-T mod. Nothing changed. -I've re-cleaned each and every ground cable and terminal. Nothing changed. -I've wiggled the cables while measuring, APPS voltage remained steady. Does anything immediately ring a bell and sound like something you think you know what it is? If not, where do I go from here? Thanks for all the help.